Concrete block



FIG. 1 is a top, front, and left side perspective view of a concrete block, according to our new design;

FIG. 2 is a top plan view of the concrete block of FIG. 1;

FIG. 3 is a bottom plan view of the concrete block of FIG. 1;

FIG. 4 is a front elevation view of the concrete block of FIG. 1;

FIG. 5 is a rear elevation view of the concrete block of FIG. 1;

FIG. 6 is a right side view of the concrete block of FIG. 1;

FIG. 7 is a left side view of the concrete block of FIG. 1; and,

FIG. 8 is a bottom, rear, and left side perspective view of the concrete block of FIG. 1.

The features depicted in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a concrete block, as shown and described. 